Finally got around to fitting my USB lead the the dashboard...
That is a USB memory sitck plugged in and tried a few music videos on it and it seems to play all formats so far.
Made a bit of hash of cutting out the hole but it works and I have a spare front piece to have another attempt.
Just got to figure out how to tether my phone to the unit (it's a new phone too so have to learn about that first). Might think about a 3G donlge for it instead of my PAYG phone.